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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c326263a26b1ac67321fdd8ab2178b02ff9026ef01fc8b67b17be74232a4882' 
  AND token = 'n4EgSqDBTCYwCoCn/rmxdODvfcfAdIy7/pSKJwnCRGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}